![]() But it differs from the diode as it has identical features for its directions (left and right sides) of traversing voltage. The varistor is similar to the diode because of its nonlinear, non-ohmic current-voltage feature. Since the varistor helps to protect circuits from any voltage surge or fluctuations, it’s vital to place it in a shunt with the protected device. And there’s a drastic drop in resistance when there’s an excess increase in voltage. So, when the varistor’s voltage increases, resistance decreases. In other words, its resistance tends to change spontaneously based on the change in voltage across the device. The VDR name is because the device helps to protect electronic devices from overvoltage transients. You can also call the two-terminal semiconductor device a VDR (voltage-dependent resistor). In short, we’ll take you through everything you need as a beginner.Ī varistor is a term in the electrical world that combines two words: variable and resistor. We’ll talk more about this later in the article. So, it comprises a diagonal line with a bit of added section passing through a rectangle. The term refers to a circuit representation of the varistor. Also, there’s something we call the Varistor Symbols. Are you unfamiliar with the term? A varistor refers to an electronic part that comes with an electrical resistance that differs from the applied voltage. But the good news is: the varistor is the perfect electrical component for the job. And it’s because this situation affects the circuit badly. Then, you start having issues with high voltage surges. Picture this: you’re working on your electrical project smoothly. ![]()
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